Date: 2013sep18 Product: gmail Q. How can I identify when a mail is coming from? A. You can make a unique mail address for each service you give your address to. For example with gmail, all these work:

yourname@gmail.com yourname+001@gmail.com yourname+002@gmail.com yourname@googlemail.com yourname+001@googlemail.com yourname+002@googlemail.com

Replace "001" with something to identify the service. If they send too much spam you can block that address.